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337 Belvedere Avenue
Belvedere Island · Listed by Monica Costa, Engel & Völkers
$17,000,000
A masterpiece of vistas on the prestigious west hillside of Belvedere Island.
A contemporary waterfront estate about 80 feet above the bay, with views from the Golden Gate to the Bay Bridge. Four levels include a 60-foot indoor heated pool, a dedicated spa level with steam room, sauna and hot tub, a bay-view gym, a wine room and two elevators. Minutes from Belvedere’s two yacht clubs.
The finest homes in Marin County & San Francisco
Marin County
San Francisco
The four most expensive homes currently for sale in Marin County and in San Francisco, from the MLS via IDX Broker, October 28, 2026. Except for 337 Belvedere Avenue, listings are represented by other brokerages; brokerage details appear on each listing page. Information deemed reliable but not guaranteed.
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Meet
Monica & Michelle
Two partners.
Both sides of the bridge.
One standard.
A native San Franciscan, Michelle Pender has built her career around an intimate understanding of San Francisco’s distinctive neighborhoods, architecture, microclimates and complex real estate landscape. Her experience spans luxury residences, multifamily properties, condominiums, TICs and co-ops, complemented by sophisticated marketing, strong negotiation skills and a highly personalized, white-glove approach. As a member of Engel & Völkers Private Office, Michelle also brings access to an exclusive international network of advisors and premium properties.
That deep San Francisco expertise is complemented by Monica Costa’s extensive presence across Marin County and the greater Bay Area. A founder of Engel & Völkers Marin County who has also served as Marin County Manager and VP of Sales, Monica brings more than 20 years of experience spanning luxury real estate, marketing, fashion, automotive and yachting. Her background in International Business and Marketing, combined with her experience representing distinctive properties, investors and luxury buyers, gives the partnership a strategic perspective that extends well beyond a traditional residential transaction.
Their combined expertise is particularly relevant as AI-generated wealth continues to reshape the San Francisco luxury market and expand buyer interest beyond the city. Recent reporting describes significant AI-driven demand at the upper end of San Francisco real estate, while Monica has seen a related pattern in her own Marin practice: an emerging trend of San Francisco buyers looking north across the Golden Gate for greater privacy, space, nature and long-term quality of life.
Together, Michelle and Monica create a natural bridge between San Francisco and Marin County. Michelle provides the granular knowledge and relationships needed to navigate San Francisco, while Monica brings deep Marin expertise and an understanding of the communities increasingly attracting buyers north of the Golden Gate, from Sausalito and Mill Valley to Tiburon, Belvedere, Ross and Kentfield. For executives, founders, investors and families considering a move between the two markets, clients can work with one collaborative team that understands both sides of the bridge.
For clients navigating divorce or another significant life transition, that cross-market perspective can be especially valuable. Whether the decision involves selling a San Francisco property, retaining a home, purchasing separately, relocating to Marin, or repositioning real estate as part of a broader financial transition, Monica and Michelle bring together local knowledge, discretion, strategic marketing and negotiation expertise across two of the Bay Area’s most important luxury markets.
What our clients say
We interviewed numerous agents before choosing Monica to sell our unique family home that came with a host of challenges and opportunities. We chose her because of her willingness to work within our interests rather within the typical formulaic model for selling homes. Monica demonstrated unusual fortitude and determination and humanity throughout this process. I so appreciate how Monica balanced conducting herself in a highly professional manner while tuning in to the needs and interests of us as a family. She remained highly communicative and shared every bit of buyer feedback with us throughout. Monica scheduled showings constantly, and was present and accommodating every time. We felt heard, we recognized her tenacity and willingness to work with us, and we witnessed her ability to skillfully navigate our interests without holding back on assuring we understood each situation and offer every step of the way. Thank you Monica for your grace, insight, patience, and willingness to help us reach our best outcome.
As an estate attorney, I've worked with countless real estate agents over the years. Michelle Pender stands out as one of the very best. She’s that rare combination of deep market expertise, tireless work ethic, and genuine care for her clients that we all want in our real estate agent, but rarely find.
She is always prepared, comes to the table with a smart, strategic marketing plan, and consistently delivers excellent results. She’s hyper-responsive, a master of the details, and an exceptional advocate. Moreover, her clients love and trust her. She works hard to build lasting relationships, goes the extra mile on every transaction, and keeps upping her game. She makes hard things feel easy, and once she’s on the job, she simply doesn’t rest until the deal is done and the client is happy.
If you want a warm, smart, and dedicated agent, give Michelle a call!
Working with Michelle as my buying agent has been a wonderful experience! She helped me to purchase my dream home in the competitive San Francisco housing market and guided me patiently through the entire process making sure I understood what I was reviewing and signing, and never hesitated in explaining things thoroughly to me. Additionally, she does not only show the properties but makes you understand the area/neighborhood and raises your awareness of the reasons why you might like or dislike a place. Michelle’s expert knowledge of the market, strong network and negotiation skills, attentiveness and responsiveness demonstrate her commitment to her profession and to her clients. Lastly, I was most impressed by how she supported me even after closing on the home. I’m really grateful to have worked with Michelle and will continue to recommend her!
From start to finish, working with Michelle Pender was a total game‑changer. She’s extremely knowledgeable about every San Francisco micro‑neighborhood, blending big‑city experience with genuine local insight. Her energy and enthusiasm kept us motivated, even in a competitive market.
Michelle wasn’t just responsive—she met every question and concern with clarity and grace. When we hit a snag, she anticipated our needs and guided us with white‑glove service, shining in negotiation and strategic advice. Her marketing smarts and direct approach helped our listing stand out—and the outcome exceeded expectations.
If you want an agent who’s a fierce advocate, a skilled negotiator, and a warm partner through every step—Michelle delivers. She treated us like family, not a transaction.
I have worked with Monica for two years involving multimillion-dollar projects. To be concise, the appropriate adjectives for her skills: smart, articulate, creative, thorough, knowledgeable, proactive, inquiring, close attention to details while understanding the big picture.
Working with Michelle Pender of Engel & Völkers was an absolute pleasure from start to finish. As a seller, I couldn’t have asked for a more professional, knowledgeable, and results-driven Realtor and she always had my best interests front and center.
Her market expertise was immediately apparent — she provided a strategic pricing plan, expert staging guidance, and a marketing plan that created maximum exposure.
Michelle was especially outstanding when it came to negotiations. Her calm confidence and sharp instincts led to an excellent outcome that exceeded my expectations.
Beyond her professionalism, Michelle is genuine, patient, and a true pleasure to work with. I highly recommend Michelle Pender to anyone seeking an exceptional Realtor who combines integrity, expertise, and heart — she’s a true standout in her field!
Michelle helped my husband and I buy our very first home. Being first time home buyers we were new to everything and Michelle helped us to navigate our way through the process with ease and she made it fun!! If you are looking for someone who is always in your corner and willing to do whatever it takes to get the place you absolutely love, then Michelle is for you. She is someone who is determined to get you what you want and is not afraid to give you advice you don’t always want to hear, but that you sometimes need to. She is the perfect combination of professional, knowledgeable and friendly. I would highly recommend her to anyone!
Michelle understood exactly what my husband and I were looking for from the start. She truly got it. She was always quick to respond at any time of the day, super helpful, and incredibly resourceful. Michelle connected us with trusted lenders, home insurance providers, and other professionals we needed, saving us time, stress, and a lot of legwork. It honestly felt like everything just fell into place because of her. On top of that, she’s empathetic, a great listener, gives honest advice, and truly works with her clients’ best interests at heart. We found our dream home fast, and she made the whole process feel easy!
Monica is an exceptional Real Estate Advisor. She helped selling my house for 10% over asking price, and then helped me buy my new place for under asking in a seller’s market. She absolutely surpassed my expectations (which were high). From market analysis, to help determine the right listing price, to marketing plan and execution, to specific ROI focused curb appeal enhancement recommendations, and all the way down the line she was professional yet warm, attentive and business savvy. I wholehearted recommend her to anyone, whether buying or selling.
Michelle is the best! She really took the time to get to know us and what we wanted in our first home. When we began working with her, we went on the "Michelle Pender Grand Tour" where she took us around to all the open houses we wanted to see to truly understand what we valued in a home. Her patience and support never made us feel rushed and for such a big life moment, it never felt overwhelming with Michelle. Her knowledge of the market and connections were also invaluable, whether that be a locksmith or designer or lender or really anything you can think of, Michelle has a top tier contact for just that thing. We were lucky to work with Michelle to purchase our first home and will 100% work with her again if we are lucky enough to buy a 2nd! We can't recommend Michelle enough!
Michelle Pender epitomizes white-glove service in the San Francisco real estate market for her clients. She consistently goes above and beyond to ensure her clients' satisfaction, regardless of the challenges that may arise. I highly recommend her to anyone seeking exceptional support during their real estate journey in San Francisco. She has been an outstanding partner, and I have full confidence that she will provide excellent care to all my clients in the area. If you're searching for the best real estate advisor in San Francisco, look no further—Michelle is the one!
Notable Sales
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Monica & Michelle on video
Home tours and real estate advice from Monica Costa and Michelle Pender.
More on Monica's YouTube channelMore on Michelle's YouTube channel
Life on the water
Beyond the home: explore yachts for sale and charter through Engel & Völkers Yachting.
Explore yachtsLet’s talk about your next move.
Curious what your home is worth, or ready to start looking? Send a note and we’ll be in touch.
M&M’s Blog
The Anthropic IPO and the Marin County & San Francisco Housing Market
By Monica Costa & Michelle Pender
Engel & Völkers · Marin County & San Francisco
Anthropic, the San Francisco company behind Claude, is about to become one of the largest public companies in the world. Here is what its IPO, and OpenAI’s, could mean for home prices on both sides of the Golden Gate, when the buying is likely to happen, and how we help newly liquid buyers find the right home and move.
- Anthropic has publicly filed to list on Nasdaq under the ticker ANT. Reports point to trading as soon as mid-November 2026.
- Reported valuations of $1.5 to $2 trillion would create thousands of newly wealthy employees, most of whom live in or near San Francisco.
- Demand should arrive in waves: first from cash already unlocked, then around the typical ~180-day lockup expiry in spring 2027.
- San Francisco houses are already selling far over asking. Marin County is the natural next step for buyers who want space, privacy and schools within a ferry ride of the city.
- We help buyers time the purchase, finance it with equity, find off-market homes and relocate, with one team on both sides of the bridge.
Anthropic in the news: where the IPO stands
Anthropic submitted a confidential IPO filing to the SEC on June 1, 2026, about a week ahead of OpenAI. In late October it made its prospectus (Form S-1) public, and on November 2 it filed an amended version adding third-quarter results of roughly $17 billion in revenue, along with very large long-term commitments for cloud computing.
Bloomberg and Yahoo Finance report that shares could begin trading as soon as November 16. The Wall Street Journal and others report a raise of $100 billion or more at a $1.5 to $2 trillion valuation, which would rival SpaceX’s record offering in June. The filing is also candid about risk, including a net loss of about $80.7 billion in the first half of 2026, driven mainly by spending on computing power.
OpenAI has filed confidentially as well, but has not set a date; reports range from late 2026 into 2027. Together, these two San Francisco companies represent the largest concentration of new private wealth the Bay Area has seen since the Facebook IPO in 2012, on a far larger scale.
Why this IPO matters more to local housing than most
Most tech IPOs spread wealth across a national workforce. AI wealth is concentrated in a relatively small group of employees and early investors who overwhelmingly live in the Bay Area, many of them near the AI offices in Mission Bay, SoMa, Hayes Valley and the Mission. Redfin estimated that OpenAI and Anthropic employees could, in theory, buy nearly 29% of the homes in the San Francisco metro with their IPO windfalls. That will not literally happen, but it shows how much buying power is about to meet a market with very few homes for sale.
San Francisco’s chief economist has compared the moment to Uber’s 2019 IPO, which was a small fraction of this size, while housing advocates have raised concerns about affordability for residents outside the AI economy. Both are true: this is a real demand shock, and it will land unevenly.
What happens to San Francisco home prices
San Francisco was already the most competitive market in the region before a single share traded:
- The median San Francisco house sold for about $1.85 million in August 2026 and the median condo for about $1.26 million, both up roughly 23% from a year earlier.
- In September, about 92% of houses sold over asking; in August, houses averaged roughly 22% over list.
- House supply was under one month in August, down about a third from a year earlier.
Our view: the sharpest pressure will stay on move-in-ready single-family homes with outdoor space and parking in Noe Valley, Cole Valley, Potrero Hill, Bernal Heights and the Inner Sunset, while luxury buyers move up to Pacific Heights, Presidio Heights, Sea Cliff and Russian Hill. Condos remain the relative value: they sold for only about 4% over asking on average this summer.
What happens to Marin County home prices
Marin has historically absorbed San Francisco’s wealth waves a few months later, as buyers who start in the city look north for space and quality of life. The setup is tight:
- Marin’s Q3 2026 single-family median was about $1.70 million, up 5.9%, with open-market sales up about 13% (BAREIS MLS).
- Only about 290 single-family homes were for sale in early October, roughly 1.8 months of supply.
- About 13% of Marin sales closed off the MLS in Q3, nearly a fifth of the dollar volume. The best homes often trade quietly.
- Homes in contract within two weeks sold for roughly 11% over asking; homes that sat past 120 days sold well under.
Where we expect IPO-driven buyers to focus: Sausalito and Tiburon for the ferry and views, Mill Valley for walkability and redwoods, Belvedere for waterfront estates, Ross and Kentfield for land and schools, and Larkspur, Greenbrae and Corte Madera for family neighborhoods near the Larkspur ferry. Second-home demand should rise in Stinson Beach and Bolinas too.
The timeline: why demand will come in waves
| Window | What usually happens | Housing effect |
|---|---|---|
| Now to IPO day | Buyers with cash from earlier tender offers or secondary sales move first; others line up lenders. | Competition for top SF houses; private Marin previews. |
| First 6 months after IPO | Most employee shares are locked up. Some buy on salary and RSU income or borrow against stock. | Steady high-end demand; renters start touring Marin. |
| Lockup expiry, around spring 2027 | Employees can sell and many diversify. Spring is also Marin’s busiest season. | Likely the biggest wave of offers, especially from $3M to $10M. |
| A second AI IPO | If OpenAI lists, a second, overlapping wave follows. | Extended pressure on both markets into 2027. |
Two things could cool this: a weak share price after listing, which shrinks paper wealth quickly, and mortgage rates, which were about 7.4% for a 30-year fixed in mid-October. Anyone planning a purchase should size it on a conservative share price, not on IPO-day headlines.
If you are selling in Marin or San Francisco
- Consider listing before the lockup wave. Inventory is low now; in spring you will compete with more listings, even as more buyers arrive.
- Price for the first two weeks. In Marin, speed and price go together.
- Have insurance and inspections ready on day one, especially on wooded or hillside lots, so a fast-moving buyer is not slowed down.
- Ask about a private preview. Many AI buyers value discretion and will pay to secure a home before it reaches the MLS.
- Be wary of “stock as payment.” Several Bay Area sellers have advertised accepting pre-IPO AI shares; those deals have rarely closed. Cash at closing is still the standard.
If you work at Anthropic, OpenAI or another AI company
1 · Map your liquidity before you tour
Know your vesting dates, lockup terms, trading windows and estimated tax bill. A CPA should run the numbers before you set a price range.
2 · Choose your financing path
| Path | Best when | Watch for |
|---|---|---|
| Buy now with a jumbo mortgage | Your salary and RSU history qualify on their own | Higher payment at today’s rates |
| Borrow against public stock | You want a cash-like offer without selling | Margin calls if the stock falls; floating rates |
| Wait for the lockup, buy with sold shares | You can be patient and want simplicity | Share price at expiry; spring competition |
| Rent first, buy later | You are new to the area or still choosing a town | Moving twice; rents are rising too |
3 · Pick a town by how you live
Commute, schools, microclimate, privacy and land narrow a Marin search quickly. Our commute calculator compares drive and ferry times from every Marin town to Mission Bay, SoMa and the Financial District.
4 · Write an offer that looks like cash
Verified funds, a fully underwritten loan rather than just a pre-approval, short contingencies and a flexible close win in both markets. Our guide to buying a home with startup equity covers RSUs, tender offers, lockups and stock-secured loans in detail.
How we help you find a home and relocate
We are two Engel & Völkers Realtors working as one team across the Golden Gate. Michelle Pender, a native San Franciscan and member of Engel & Völkers Private Office, leads in the city. Monica Costa, a founding member of Engel & Völkers Marin County with more than 20 years in luxury real estate, leads in Marin. For AI founders, executives, early employees and their families, that means:
- Equity-aware planning. We coordinate with your CPA, wealth manager and lenders who regularly underwrite RSUs, tender offers and stock-secured loans.
- Off-market and private access. Early looks at homes in Belvedere, Tiburon, Ross, Kentfield, Mill Valley and San Francisco’s best neighborhoods before they go public.
- Sell in the city, buy in Marin, in one plan. We sequence both sales, including rent-backs and bridge options, so you move once.
- Relocation for new hires. Joining an AI company in San Francisco? We run neighborhood tours, school and commute research, and rent-first-then-buy plans.
- Discretion. Confidential showings, NDAs on request, guidance on holding title in a trust with your attorney, and video tours and e-signing when you are heads-down.
- Sellers ready for this buyer. If you own in Marin or San Francisco, we know how AI buyers search and what they pay for, and we position your home to match.
Frequently asked questions
When is the Anthropic IPO?
Anthropic publicly filed its S-1 in late October 2026 and amended it on November 2 with third-quarter results. Reports indicate trading on Nasdaq under the ticker ANT could begin as soon as mid-November 2026. No final date or price has been announced.
Will the Anthropic IPO raise San Francisco home prices?
It adds significant buying power to a market with very little inventory, so upward pressure is likely, especially on move-in-ready houses. Because most employee shares are locked up for months, expect the effect to build in waves through 2027 rather than spike overnight.
Will AI IPO wealth move into Marin County?
Yes. Marin has historically absorbed San Francisco wealth waves, and AI buyers are already looking north for privacy, land, schools and a ferry commute. Sausalito, Mill Valley, Tiburon, Belvedere, Ross, Kentfield and Larkspur are the most common choices.
Should I buy before or after my IPO lockup ends?
It depends on whether your income qualifies today, your tolerance for stock-price risk and how soon you need to move. Buying now with a mortgage, borrowing against stock, waiting for the lockup and renting first all work in the right situation. Review them with a CPA and an equity-savvy lender.
Can I pay for a house with pre-IPO stock?
Rarely in practice. A few Bay Area sellers have advertised it, but sellers and escrow almost always need cash at closing. Selling shares when permitted, borrowing against public stock or bridge financing are the usual routes.
Who can help me relocate from San Francisco to Marin County?
Monica Costa (CA DRE #02063023) and Michelle Pender (CA DRE #01911642) of Engel & Völkers work as one team across both markets: Michelle on the San Francisco side and Monica on the Marin side, coordinating timing, equity-aware financing, off-market searches and the move. Call Monica at (415) 480-9424 or Michelle at (415) 283-6983.
Planning a move around the IPO? Book a confidential conversation and we will map your timing, financing options and the neighborhoods that fit, including homes coming to market quietly. Monica: (415) 480-9424 · Michelle: (415) 283-6983.
Talk with usSources: CNBC (amended S-1 and Q3 revenue, Nov 2, 2026); Yahoo Finance and Bloomberg (IPO timing, Oct 2026); NBC News (first-half 2026 results); San Francisco Chronicle (valuation and lockup, Nov 1, 2026); ABC7 News (Oct 27, 2026); CNN with Redfin estimate (Aug 17, 2026); The Real Deal (June–July 2026); BAREIS MLS Q3 2026 via Imagine Marin; Helm Real Estate and Compass data via Haven Group SF; Freddie Mac (mid-October 2026). Figures cover different periods. This article is general information, not investment, tax, legal or lending advice; IPO timing, pricing and lockup terms are set by the company and can change.
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